Remove support for streaming responses for v1 callables.

Author: taeold

src/common/providers/https.ts

@@ -782,6 +782,13 @@ function wrapOnCallHandler<Req = any, Res = any>(
       }
 
       const acceptsStreaming = req.header("accept") === "text/event-stream";
+
+      if (acceptsStreaming && version === "gcfv1") {
+        // streaming responses are not supported in v1 callable
+        throw new HttpsError('invalid-argument', "Unsupported Accept header 'text/event-stream'")
+      }
+
+
       const data: Req = decode(req.body.data);
       let result: Res;
       if (version === "gcfv1") {